package com.after.saas.common.utils;

import java.security.MessageDigest;

public class Md5Utils {
    /***
     * MD5加码 生成32位md5码
     */
    public static String string2MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16) {
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();

    }

    /**
     * 加密解密算法 执行一次加密，两次解密
     */
    public static String convertMD5(String inStr) {

        char[] a = inStr.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;

    }

    // 测试主函数
    public static void main(String args[]) {
        String s = "123456";
        String salt1=HashUtil.generateSalt(32);
        String salt2=HashUtil.generateSalt(32);
        System.out.println(String.format("salt:%s\t%s",salt1,salt2));
        String oldPass1 = Md5Utils.string2MD5(s+salt1);
        String oldPass2 = Md5Utils.string2MD5(s+salt2);
        System.out.println(String.format("md5:%s\t%s",oldPass1,oldPass2));
        String curPass=string2MD5(s+salt1);
        System.out.println(curPass.equals(oldPass1));
        System.out.println("原始：" + s);
        System.out.println("MD5后：" + string2MD5(oldPass1));
//        System.out.println("加密的：" + convertMD5(s));
//        System.out.println("解密的：" + convertMD5(convertMD5(oldPass1)));
    }


}
